function showadv(id,ob_char)
{
	Expanda=document.all.item(id+"_a");
	Expanda.blur();
	advshow=document.all.item(id);
	treeimg=document.all.item(id+"_img");

	if (advshow.style.display=="block")
	{
		advshow.style.display="none";
		treeimg.src="images/plus.gif";
	}
	else
	{
		advshow.style.display="block";
		treeimg.src="images/minus.gif";
	}
}